Nissan Sentra B18 (2020-2025) Service Manual: High Pressure Fuel Pump
Component Function Check
Component Function Check
-
CHECK HIGH PRESSURE FUEL PUMP FUNCTION
With CONSULT-
Start engine.
-
Select “FUEL PRES SEN V” in “DATA MONITOR” mode of “ENGINE” using CONSULT and check the indication as per the following conditions.
Monitor item
Condition
Indication
FUEL PRES SEN V
At idle
0.820 – 1,140 V
Revving engine up to 4,000 rpm quickly.
0.820 – 2,900 V
Without CONSULT-
Start engine.
-
Check the voltage between ECM terminals as per the following conditions.
ECM
Condition
Voltage
Connector
+
−
Terminal
F25
67
68
[Engine is running]
-
Warm-up condition
-
Idle speed
Note:
The pulse cycle changes depending on rpm at idle.
[Engine is running]
-
Warm-up condition
-
Engine speed: 2,000 rpm
-
Is the inspection result normal?
YES >>INSPECTION END
NO >>Refer to Diagnosis Procedure.
-
Diagnosis Procedure
Diagnosis Procedure
-
CHECK FUSE
-
Turn ignition switch OFF.
-
Check that the following fuse is not blowing.
Fuse No.
Capacity
#68
10 A
Is the fuse blown (open)?
YES >>Replace the fuse after repairing the applicable circuit.
NO >>GO TO 2.
-
-
CHECK HIGH PRESSURE FUEL PUMP POWER SUPPLY
-
Turn ignition switch ON.
-
Check the voltage between ECM harness connector and ground.
+
−
Voltage
ECM
Connector
Terminal
F25
66
Ground
Battery voltage
Is the inspection result normal?
YES >>GO TO 9.
NO >>GO TO 3.
-
-
CHECK HIGH PRESSURE FUEL PUMP POWER SUPPLY CIRCUIT
-
Turn ignition switch OFF.
-
Disconnect ECM harness connector.
-
Disconnect high pressure fuel pump relay harness connector.
-
Check the continuity between ECM harness connector and high pressure fuel pump relay harness connector.
ECM
High pressure fuel pump relay
Continuity
Connector
Terminal
Connector
Terminal
F25
66
F61
2
Existed
-
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >>GO TO 4.
NO >>Repair or replace malfunctioning part.
-
-
CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY (CONTACT SIDE)
Check the voltage between high pressure fuel pump relay harness connector and ground.
+
−
Voltage
High pressure fuel pump relay
Connector
Terminal
F61
1
Ground
Battery voltage
Is the inspection result normal?
YES >>GO TO 5.
NO >>Perform the trouble diagnosis for power supply circuit.
-
CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY (EXCITATION COIL SIDE)
-
Install all removed parts.
-
Turn ignition switch ON.
-
Check the voltage between high pressure fuel pump relay harness connector and ground.
+
−
Voltage
High pressure fuel pump relay
Connector
Terminal
F61
3
Ground
Battery voltage
Is the inspection result normal?
YES >>GO TO 7.
NO >>GO TO 6.
-
-
CHECK HIGH PRESSURE FUEL PUMP RELAY POWER SUPPLY CIRCUIT (EXCITATION COIL SIDE)
-
Turn ignition switch OFF.
-
Disconnect IPDM E/R harness connector.
-
Disconnect high pressure fuel pump relay harness connector.
-
Check the continuity between IPDM E/R harness connector and high pressure fuel pump relay harness connector.
IPDM E/R
High pressure fuel pump relay
Continuity
Connector
Terminal
Connector
Terminal
F96
73
F61
3
Existed
-
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >>Perform the trouble diagnosis for power supply circuit.
NO >>Repair or replace malfunctioning part.
-
-
CHECK HIGH PRESSURE FUEL PUMP RELAY GROUND CIRCUIT
-
Turn ignition switch OFF.
-
Disconnect high pressure fuel pump relay harness connector.
-
Check the continuity between high pressure fuel pump relay harness connector and ground.
High pressure fuel pump relay
—
Continuity
Connector
Terminal
F61
4
Ground
Existed
-
Also check harness for short to ground.
Is the inspection result normal?
YES >>GO TO 8.
NO >>Repair or replace malfunctioning part.
-
-
CHECK HIGH PRESSURE FUEL PUMP RELAY
Refer to Component Inspection.
Is the inspection result normal?
YES >>Check intermittent incident. Refer to Intermittent Incident.
NO >>Replace high pressure fuel pump relay.
-
CHECK ECM GROUND CIRCUIT
-
Turn ignition switch OFF.
-
Disconnect ECM harness connector.
-
Check the continuity between ECM harness connector and ground.
ECM
—
Continuity
Connector
Terminal
F24
5
Ground
Existed
65
F25
69
E16
157
159
162
-
Also check harness for short to power.
Is the inspection result normal?
YES >>GO TO 10.
NO >>Repair or replace malfunctioning part.
-
-
CHECK HIGH PRESSURE FUEL PUMP CIRCUIT
-
Disconnect high pressure fuel pump relay harness connector.
-
Check the continuity between ECM harness connector and high pressure fuel pump harness connector.
ECM
High pressure fuel pump
Continuity
Connector
Terminal
Connector
Terminal
F25
67
F32
1
Existed
68
2
-
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >>GO TO 11.
NO >>Repair or replace malfunctioning part.
-
-
CHECK HIGH PRESSURE FUEL PUMP
Refer to Component Inspection.
Is the inspection result normal?
YES >>GO TO 12.
NO >>Replace high pressure fuel pump. Refer to Removal and Installation.
-
CHECK HIGH PRESSURE FUEL PUMP INSTALLATION
-
Turn ignition switch OFF.
-
Check high pressure fuel pump for improper attachment or looseness.
Is the inspection result normal?
YES >>GO TO 13.
NO >>Repair or replace malfunctioning part.
-
-
CHECK CAMSHAFT
-
Remove camshaft. Refer to Removal and Installation.
-
Check camshaft. Refer to Inspection.
Is the inspection result normal?
YES >>Check intermittent incident. Refer to Intermittent Incident.
NO >>Replace camshaft. Refer to Removal and Installation.
-
Component Inspection
Component Inspection
-
CHECK HIGH PRESSURE FUEL PUMP-1
-
Turn ignition switch OFF.
-
Disconnect high pressure fuel pump harness connector.
-
Check the resistance between high pressure fuel pump terminals as per the following conditions.
High pressure fuel pump
Condition
Resistance
Terminal
1
2
Temperature [°C (°F)]
20 – 30 (68 – 86)
0.46 – 0.51 Ω
Is the inspection result normal?
YES >>GO TO 2.
NO >>Replace high pressure fuel pump. Refer to Exploded View.
-
-
CHECK HIGH PRESSURE FUEL PUMP-2
With CONSULT-
Reconnect high pressure fuel pump harness connector.
-
Start engine.
-
Select “FUEL PRES SEN V” in “DATA MONITOR” mode of “ENGINE” using CONSULT and check the indication as per the following conditions.
Monitor item
Condition
Indication
FUEL PRES SEN V
At idle
0.820 – 1.140 V
Revving engine up to 4,000 rpm quickly.
0.820 – 2.900 V
Without CONSULT-
Start engine.
-
Check fuel rail pressure sensor signal voltage.
ECM
Condition
Voltage
(Approx.)
Connector
+
−
Terminal
F24
44
45
[Engine is running]
-
Warm-up condition
-
Idle speed
0.82 – 1.14 V
[Engine is running]
-
Warm-up condition
-
Engine speed: Revving engine from idle to 4,000 rpm
0.82 – 2.90 V
Is the inspection result normal?
YES >>INSPECTION END
NO >>Replace high pressure fuel pump. Refer to Exploded View.
-
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Headlight control switch
Type A (if so equipped)
Type B (if so equipped)
Lighting
Rotate the switch to the
position to turn on the front parking lights, tail lights, license plate lights,
and instrument panel illumination. The
indicator will illuminate in the meter.
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